JPS6222872A - Printing ink - Google Patents

Abstract

PURPOSE:To improve printing workability by preventing premature drying of a printing ink on a printer or during storage, by adding a 6C or higher alcohol to a printing ink comprising a dye and varnish. CONSTITUTION:A 6C or higher alcohol is added to a printing ink comprising a dye and varnish to obtain the desired printing ink. Alcohols which are nonvolatile or difficultly volatile at room temp. and soluble in varnish or can be stably dispersed in varnish are preferred. Examples of such alcohols are isostearyl alcohol, heptyl glycolate and diethylene glycol laurate. The alcohol is used in an amount of 5-70pts.wt. per 100pts.wt. printing ink. Even when the printing ink contains a 6C or higher alcohol, the quick dryness of the ink after printing on paper is not deteriorated.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a printing ink, and more specifically, it is particularly suitable for printing on absorbent printing materials such as paper, and has excellent quick drying properties and excellent printing properties. Concerning printing ink that provides workability.

(Prior Art) Conventionally, various printing inks have been known for imparting designs to various printing materials.

For example, for printing on non-absorbent printing materials such as plastic films, metals, glass, etc., solvent evaporation printing, which dries by evaporation of the solvent it contains, is used.

Ink is used, and for absorbent printing materials such as paper, printing inks that dry by absorbing the solvent they contain, such as lithographic printing ink, intaglio printing ink, letterpress printing ink, silk screen printing Ink etc. are known.

(Problem to be solved by the invention) The various printing inks mentioned above apply a thin film of ink to the surface of a printing plate according to each printing format, and transfer the applied ink to the printing material. Then, the printing ink is set by drying the varnish by evaporation of the solvent, absorption of the solvent, oxidative polymerization of the varnish, etc.

Therefore, it is preferable for these printing inks to dry quickly after transfer, and measures are being taken to do so. However, on the other hand, it is desirable to prevent these printing inks from drying as much as possible during storage or printing. required. In order to adjust these conflicting demands, the drying properties are controlled.

However, while some conventional printing operations may be continuous for long periods of time, most are interrupted only from time to time1. will be done. In such cases, since the printing ink is given appropriate drying properties as mentioned above, the printing ink layer adhering to the printing plate or blanket of the printing press during the interruption will dry on the press during the interruption. It turns out.

If it dries on the machine in this way, you will not be able to print satisfactorily the next time you start printing, so either remove the printing ink immediately after printing is interrupted, or remove the adhering printing ink before printing starts. It is necessary to remove it.

Such work requires, for example, 1 to 2 hours, during which time printing cannot be performed, and the work requires manpower, making it extremely uneconomical from an industrial standpoint.

Therefore, it would be ideal to have a printing ink that does not dry out on the printing press during storage, during preparation before printing, or during printing interruptions, but which nevertheless has a sufficient drying speed on the substrate after printing. , and there is a strong demand for such printing inks. Since these requirements are contradictory, it has not been possible to provide a printing ink having the above-mentioned characteristics in the past.

The inventor of the present invention solved the above-mentioned drawbacks of the conventional technology and, as a result of intensive research in order to meet the above-mentioned demands of the industry, found that when adding a specific compound to a conventional printing ink, especially a polymeric printing ink, It dries very slowly during storage and on the printing press.
Therefore, even if a printing operation is interrupted at night, for example, the printing ink will not dry on the printing machine, so there is no need to clean the printing machine when the next printing starts, and printing can be started immediately. The present invention was completed based on the finding that an applied printing ink can be dried sufficiently quickly.

(Means for solving the problems) That is, the present invention is a printing ink characterized by adding an alcohol having 6 or more carbon atoms to a printing ink consisting of a colorant and a varnish.

Next, to explain the present invention in more detail, the present inventor has conducted various studies on additives for printing inks, particularly oxidation-polymerized printing inks, and has discovered that a specific compound, that is, an alcohol having 6 or more carbon atoms, has been added to this additive. When added to printing ink such as It has been found that the printing ink dries in a significantly shorter time than known printing inks, and therefore the various problems of the prior art as described above can be easily solved.

More specifically, the alcohols having 6 or more carbon atoms that function as described above and are used in the present invention are as follows.

(1) Aliphatic alcohols hexanol, heptatool, octatool, nonanol, decanol, undecanol, dodecanol, tridecanol, tetradecanol.

Saturated fats such as pentadecanol, hexadecamer, heptadecanol, octadecanol, nonadecanol, eicosanol, heneicosanol, docosanol, tricosanol, tetracosanol, pentacosanol, hexacosanol, heptacosanol, octacosanol, nonacosanol Group alcohols: hexenol, heptenol, octenol, undecenol, tetrazocenol, bentadecenol, hexadecenol, heptacosanol, oftadecenol, hexenol, heptenol, undecenol, totisenol, totisenol, hexadecenol, oleyl alcohol, ether alcohol, lysyl alcohol,
lysylyl alcohol, eleostearyl alcohol,
Unsaturated aliphatic alcohols such as lysylyl alcohol: Examples include alicyclic alcohols such as cholesterin, campesterin, β-sitosterin, stigmasterin, brassicasterin, and ergosterin. Preferably.

(2) Ester alcohols of hydroxycarboxylic acid and aliphatic alcohol Hydroxycarboxylic acids for forming these ester alcohols include glycolic acid, lactic acid, doroacrylic acid, oxybutyric acid, oxyvaleric acid, oxyenanthic acid, oxycaprylic acid, oxypelargonic acid, oxycapric acid, oxyundecanoic acid, oxytridecane ugly,
oxymyristic acid, oxypentadecanoic acid, oxypalmitic acid, oxyarachic acid, oxystearic acid,
Oxydinonadecanoic acid, oxyarachic acid, oxybehenic acid, oxytetracosanoic acid, oxyhexacosanoic acid, oxytriacontanoic acid, oxytetratriaconic acid, propenylglycolic acid, parasorbic acid, β-oxydihydrosorbic acid, ampletolic acid , isoampretolic acid, ricinoleic acid, ricieraidic acid, oxynaponic acid, and camoleneic acid.

Examples of alcohols for forming esters with these hydroxycarboxylic acids include Ct to C5 lower alcohols and C6 or higher aliphatic alcohols as described above. Especially preferred as such ester alcohols are those having a total carbon number of 6 to 45.

(3) Ester alcohol of polyhydric alcohol and fatty acid or ether alcohol of lower alcohol or aliphatic alcohol of 06 or more as mentioned above Polyhydric alcohols include, for example, ethylene glycol, propylene glycol, butanediol, bentanediol, hexane. Diol, heptanediol, octanediol, nonanediol, decanediol, undecanediol, dodecanediol, tridecanediol, tetradecanediol, pentadecanediol, hexadecanediol, heptadecanediol, octadecanediol, nonadecanediol, eicosanediol, diethylene glycol, Dihydric alcohols such as triethylene glycol, polyethylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol; glycerin, butanetriol, 2-
3 such as methylpropanetriol, hexanetriol, etc.
Polyglycerin such as dihydric glycerin and triglycerin, erythritol, D-1L- or raC-
triit, pentaerythritol (pentaerythritol), atonite, D-1L- or rac-arabitol (arabitol), xylit, allit, D-1L
- or rac-talit (talitol), D-, L-
or raC-sorbitol, D-1L
- or raC-Mannitol, polyhydric alcohols such as lactose, and the like.

As the alcohol for forming ether alcohol with these polyhydric alcohols, the various alcohols mentioned above are used.

In addition, fatty acids that form ester alcohols include formic acid, acetic acid, propionic acid, acetic acid, valeric acid, caproic acid,
enant s, caprylic acid, vera.

rugonic acid, capric acid, undecylic acid, lauric acid, tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, stearic acid, nonadecanoic acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, heptaconic acid, montanic acid, melisic acid , aliphatic saturated acids such as lafcelic acid, niacrylic acid, crotonic acid, isocrotonic acid, caprylic acid (
711, laurolein ugly, myristoleic acid, palmitoleic acid, oleic acid, elaidic acid, sorbic acid, linoleic acid, lylinic acid, stearolic acid, eleostearic acid, ricinoleic acid, arachidonic acid, tarpanodonic acid,
Medium to higher unsaturated fatty acids such as abietic acid, castor oil, linseed oil, soybean oil, safflower oil, sinakiri oil (1) Japanese tung oil, sunflower oil, (2) oil, hempseed oil, tall oil, sesame oil,
Examples include mixed unsaturated fatty acids obtained from wheat germ oil, corn oil, rapeseed oil, rice bran oil, dehydrated castor oil, cottonseed oil, squid oil, fish oil, whale oil, and the like.

Particularly preferred among these ether alcohols or ester alcohols are alcohols having a total carbon number of 6 to 45.

(4) Polyalkylene oxide using a monofunctional compound such as ammonia, organic amine, alcohol, or phenol as an initiator.For example, one end is a residue of ammonia, organic amine, alcohol, or phenol, and the other end is a hydroxyl group. Examples include polyethylene oxide, polypropylene oxide, polybutylene oxide, and the like.

The above examples are for explaining the present invention,
Even if it is an alcohol having 6 or more carbon atoms other than those mentioned above, those having the same functions as those mentioned above are naturally included in the present invention.

Any of the above-mentioned conventionally known specific alcohols can be used in the present invention, but those that are particularly suitable for the present invention are those that are non- to slightly volatile at room temperature and soluble or stable in varnish. It is a compound that can be dispersed.

If these specific alcohols are volatile at room temperature or are not soluble or dispersible in the varnish, drying of the printing ink on the printing press may not be sufficiently suppressed, and the printing ink may not dry after printing. drying speed becomes insufficient.

In the present invention, when the above-mentioned specific alcohols are added to printing ink, these specific alcohols are uniformly present in the printing ink during storage of the printing ink or on the printing machine, and these specific alcohols are added to the printing ink. Since the alcohol is not volatile, the polymerization and drying of the printing ink is delayed, thus solving the problems of the prior art as described above.

Furthermore, when the printing ink of the present invention is applied to a printing material,
In particular, when the printing material is an absorbent printing material such as paper, the above-mentioned specific alcohol dissolved or stably dispersed in the varnish in the printing ink is quickly absorbed into the printing material. It has been found that the components consisting of the colorant and varnish remaining on the printing material dry as quickly as or faster than conventional printing inks, and the object of the present invention has been completely achieved. be.

Therefore, the printing ink of the present invention is particularly useful as an ink for printing on absorbent printing materials such as paper, for example for lithographic printing.

In addition, it is not economical to use the specific alcohols mentioned above in too large a quantity, and the drying process after printing may be excessively delayed, and if the specific alcohols used are too small, the effects of the present invention may not be sufficient. cannot be achieved.

According to the inventor's detailed research, the above-mentioned specific alcohol used in the present invention generally accounts for about 5 to 70 parts by weight, more preferably about 7 parts by weight, in 100 parts by weight of printing ink. This proportion accounts for ~40 parts by weight, and the purpose of the present invention can be fully achieved at such a proportion.

The components of the printing ink of the present invention may be the same as those of the prior art, except for the addition of the above-mentioned specific compounds.

For example, the colorant constituting the printing ink of the present invention is a pigment or dye that is used in conventional printing ink, and any conventionally known pigment or dye can be used as it is as the colorant in the printing ink of the present invention. It is possible. Further, the amount used may be the same as that of conventionally known printing inks. For example, in 100 parts by weight of printing ink, for example, about 1
The proportion is generally 0 to 40 parts by weight.

Further, as for the varnish constituting the printing ink of the present invention, any conventionally known printing ink varnish can be used as is in the present invention, and the amount used is the same as before, for example, in 100 parts by weight of the printing ink. A proportion of about 50 to 80 parts by weight is common.

Preferable varnishes for the printing ink of the present invention are natural or synthetic oxidation-polymerizable resins used in conventional lithographic printing inks, that is, those having polymerizable double bonds in their structure and It forms a film by being mold-cured with oxygen. Many varnishes for these lithographic printing inks are known, and any of these varnishes can be used in the present invention.

The printing ink of the present invention has the above-mentioned colorant, varnish, and specific alcohol as its main constituent materials, and other conventionally known additives such as an ink solvent, a dryer, a leveling improver, a thickener, and an anti-skinning agent are also used. Either can be used in the printing ink of the invention.

For example, ink solvents are added to modify the viscosity, consistency, flow, etc. of ink, and various organic solvents conventionally used for printing inks, such as
Light oil, spindle oil, various ink solvents, machine oil, etc. can all be used, and the amount used is generally about 5 to 80 parts by weight per 100 parts by weight of printing ink.

As a dryer, cobalt, manganese, cerium,
These dryers are salts of polyvalent metals such as zirconium, lead, iron, zinc, copper, vanadium, barium, and calcium and oil-soluble carboxylic acids such as naphthenic acid, octylic acid, resin acid, and tall oil. Generally, the metal is used in an amount of about 0.005 to 0.5% by weight based on 100 parts by weight of the ink.

The printing ink of the present invention can be manufactured by any conventionally known manufacturing method, such as mixing with a roll or the like, except for adding the above-mentioned specific alcohol to the printing ink.

(Action Φ Effect) According to the present invention as described above, by adding an appropriate amount of a specific alcohol to the printing ink, the printing ink can be used during storage or on the printing press. Premature drying can be prevented, so even if a printing operation is interrupted and a considerable period of time has elapsed, the printing ink on the press remains virtually intact and undried, without any cleaning required when the next printing starts. Printing can be started immediately without any special preparatory operations.

Therefore, various problems of conventional printing presses, such as time-consuming and uneconomical cleaning and uneconomical running-in operation until printing is stabilized, have been solved. Nevertheless, this does not in any way hinder the rapid drying of the printing ink after printing, especially on absorbent printing materials.

Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples. Note that parts in the text are based on weight.

Example 1 250 parts of oxidative polymerization type varnish and 62.5 parts of instearyl alcohol were mixed, and 75.3 parts of the mixture, 6820 parts of brilliant carmite, 0.8 parts of manganese nanthenate, and 4.0 parts of No. 165 solvent were added. were mixed and kneaded using a Miki roll to obtain a printing ink of the present invention having a tack value of 10.2.

15 mJl of this printing ink O was spread on art paper using a 4-division R1 tester. The gloss of the color surface of the art paper was measured and found to be 67%. On the other hand, when the printing ink was left on an RI tester overnight and then developed in the same manner, the gloss was only 29%, indicating the excellent storage stability of the printing ink. Note that the drying time of the printing ink on the art paper was 4 hours.

In addition, after testing the above printing ink, the printing machine was left overnight without any cleaning, and printing was attempted again the next morning, and printing continued without any problems.

Comparative Example 1 65.6 parts of the varnish used in Example 1 before adding instearyl alcohol, Brilliant Carmite 6820
1, 0.8 parts of manganese naphthenate, and 14.6 parts of Solvent No. 165 were mixed and kneaded using a Miki roll to obtain a comparative printing ink having a tack value of 9.9.

When this ink was subjected to a color development test in the same manner as in Example 1, the gloss was 73%, but when left overnight on an RI tester, the gloss was 18%, indicating that the storage stability of the printing ink was He believed in being inadequate. The drying time of the printing ink on art paper was 4 hours.

In addition, in reprinting after the printing test and after being left overnight, the ink on the printing plate surface dried to form an insoluble film, resulting in poor transfer of the printing ink, and reprinting was impossible as it was.

Examples 2 to 13 Printing inks were prepared in the same manner as in Example 1, except that other specific alcohols shown in Table 1 below were used in place of the specific alcohol in Example 1, and tested in the same manner. , the results shown in Table 1 below were obtained.

To 1-2 Decanol 65294 hours 3 Rhodecanol 87314 hours 30 minutes 4 Oleyl alcohol 832E 14 hours 30 minutes - to glycolic acid 88344 hours 15 minutes Butyl ester 6 Lauric acid diene 8229 3 hours 45 minutes Thylene glycol ester 7 Capric acid pro 83284 hours Pyrene glycol ester 8 Castor oil fatty acid 60274 hours 45 minutes 9
Soybean fat and oil fatty acid 85324 hours 15 minutes Diglyceride 10 Nonylpheno-83304 hours 30 minutes - ethylene oxide adduct 11 Octylfair 83304 hours 30 minutes - propylene oxide adduct 12 Laurylamine 80284 hours 15 minutes Ethylene oxide adduct 13 Aniline propylene 60324 hours 45 minutes.
Incidentally, all of the printing inks of Examples 2 to 13 did not dry even when left on the printing press overnight.

On the other hand, in the case of a similar printing ink without the addition of specific alcohol as mentioned above, when reprinting after the printing test and after being left overnight, the ink on the printing plate dries and forms an insoluble film, causing the printing Poor ink transfer occurred, and reprinting was impossible as it was.

Claims (8)

[Claims] (1) A printing ink characterized by adding an alcohol having 6 or more carbon atoms to a printing ink consisting of a colorant and a varnish. (2) The printing ink according to claim (1), wherein the alcohol is an aliphatic alcohol having 6 or more carbon atoms. (3) The printing ink according to claim (1), wherein the alcohol is an alcohol ester of hydroxycarboxylic acid. (4) The printing ink according to claim (1), wherein the alcohol is an ester alcohol of a polyhydric alcohol and an organic acid or an ether alcohol of an alcohol. (5) The printing ink according to claim (1), wherein the alcohol is a polyalkylene oxide using a monofunctional compound as an initiator. (6) The printing ink according to claim (1), wherein the alcohol is non- to slightly volatile at room temperature. (7) The printing ink according to claim (1), wherein the alcohol is soluble or stably dispersible in the varnish. (8) Alcohol is about 5 parts by weight in 100 parts by weight of printing ink.
Claim No. (1) present in a proportion of ~70 parts by weight
Printing inks listed in section.